Bill Gasper... said: "Don't forget a data structure is merely a stupid programming language, and its point is that a data structure in effect, when given to the program that processes it, is guiding a computation and in effect constitutes a dumb little language that turns a specific application into a more specific one".
Note there is an error in the transcription of that section. He said, "Haskell, to pick a functional language" and not "Pascal" as the transcript reads.